Djokovic, who won his 18th major at the Australian Open in February, has now held the top spot for 311 weeks over the course of his career, beating Federer’s previous record of 310.
Browsing: Melbourne Park
Players and officials have to undergo a mandatory 14-day quarantine on arrival in Australia before they participate in warm-up events from January 31 at Melbourne Park, where the major will be held from February 8 to 21.
Murray has reached the final five times on the blue hardcourts at Melbourne Park and lost every one, four to the man who preceded him as world number one, Novak Djokovic
At 36, Williams is the oldest woman in the singles draw at Melbourne Park and seeded 13th for her Open era record-extending 73rd appearance at a Grand Slam
Top seed Murray conceded a 5-2 lead in a first set in which he landed less than half of his first serves, and was down 4-2 after being broken early in the second at Rod Laver Arena